When you are trying to stuff your nuts into a woman's fart pipe and as soon as you cram one in, the other nut pops out. Leaving you with only one nut in her asshole, but never two. - Very similar to trying to get two or more cats in a bathtub, one always escapes when trying to get the other in.

The only man to accomplish this feat is the very famous "aww nigga, nuts in the ass dick in da pussy" porn actor. Who overachieved the feat by keeping both nuts in a females asshole WHILE stuffing his giant dong in her vagina. Making us all feel inferior.